Attachment for artificial teeth upon bridgework.



W. M.; JACKSON. ATTACHMENT FOB ARTIFICIAL TEETH UPON BBIDGEWORK, APPLICATION 1-11.31) 001'. 16, 1908.

921,709. Patented May 18, 1909.

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VT'ITNE ES WK! I I I lNVENTOR WALTER M. JACKSON, OF NEW YORK, N. Y.

ATTACHMENT FOR ARTIFICIAL TEETH UPON BRIDG-EWORK.

Specification of Letters Patent.

Patented May 18, 1909.

Application filed October 16, 1908. Serial No. 458,108.

T 0 all whom it may concern:

Be it known that I, VALTER M. a citizen of the United States, and resident of the city, county, and State of New York, have invented a certain new and useful Attachment for Artificial Teeth upon Bridgework, of which the following is a specification.

My invention relates to a method of repairing or replacing artificial teeth on socalled bridge work, the object being to do such repairing without removing the bridge from the mouth of a patient, and also to adapt stock teeth for this work in case an artificial tooth has been broken or destroyed.

My invention is fully set forth in the fol lowing specification, reference being had to the accompanying drawings in which Figure l is an edge view of some bridge work from which a tooth is missing; Fig. 2 is a front elevation of the same; Fig. 3 is respectively an inner and an upper edge view of a Steele tooth, Fig. i is respectively a side and an inner view of a two pin stock tooth, Fig. '5 is respectively an inner and an upper edge view of tooth shown in Fig. at but which I provide with a groove. Fig. 6 is a plate or backing used by me in mounting the tooth shown in Fig. 5, Fig. 7 is respectively a side and an upper edge view of the plate shown in Fig. 6, mounted on tooth shown in Fig. 5. Fig. 8 is a side view of my improved anchor, Fig. 9 is a transverse view of the same, Fig. 10 shows the anchor screwed into the bridge work and a tooth ready for cementing into place, Fig. 11 is a central sectional view of the tooth shown in Fig. 10 in position, and Fig. 12, is a central sectional view of a Steele tooth held in place by my im proved anchor on the bridge work.

Similar reference characters denote like parts in the several views.

The bridge, 1, is usually mounted upon one or more crown teeth, 23, to provide rigidity and as a means to firmly keep the bridge and the teeth, 4:, mounted thereon in JACKSON position. The crowns are placed on natural teeth. The more common artificial teeth for this class of work are the so called Steele and the two pin tooth, both stock articles. When a Steele tooth becomes loose, there is no way of repairing or reseating it except by forcibly removing the bridge from the patients mouth. This is also true of the two pin tooth as no satisfactory or lasting job can be done by rivet ing over the pins while bridge is in the patients mouth. Therefore to replace the two pin tooth or furnish a new one, as the case may be, I cut a longitudinal groove, 5, part way down the tooth, provide a thin plate or backing, 6, of metal which is drilled, 7, and slotted, S, as shown in Fig. 6. The plate is riveted on the tooth as shown in Fig. 7 and the pins burnished even with the surface. At a proper point in the bridge work, I drill a hole which is afterward tapped to suit the anchor shown in Figs. 84). This anchor is in the shape of a T, the shank, 9, of which is threaded: the head, 10, is round in cross section and of a proper length and size to suit the groove of the tooth: Where the shank and head join, the shank is milled out, 11, on diametrically opposite sides to suit the slot in the plate 6, and also the groove in the Steele tooth.

From the foregoing description the operation of my improved method will be understood, but to more fully define the same, I will state, to insert a broken out tooth, the bridge work can be drilled and tapped to suit the anchor without any inconvenience to the patient. The anchor can be screwed in to the desired distance and the tooth fitted, the anchor being turned to give direction to the tooth, if need be, and, as the shank is provided with a fine thread a neat, tight fit can be had prior to cementing the tooth in place. When the tooth is fitted, the shank extending through the bridge work, shown in Fig. 10, is ground or filed oif, after which it is neatly burnished over.

If desired to make an extra strong job, say in the front teeth which are often thoughtlessly used to bite fruit, &c.the plate, 6, can be extended to beyond the lower edge or point of the tooth and burnished over as shown in Figs. 7, 10 and 11. This not only reinforces the toothwhich at best is only ahalf toothbut gives it the appearance of a natural tooth having an open crown.

Such being a full and clear description of my invention, what I claim as new and desire to secure by Letters-Patent is:

1. The combination of a T shaped anchor having means for fastening to a bridge, and of an artificial tooth provided with a recessed groove adapted for engaging said anchor.

2. T he combination of a T shaped anchor having;' means for fastening; to a bridge, an artificial tooth provided with a longitudr nal groove extending; part way down on its inner surface, of a metallic hacking" provided with a slot narrower than the groove in said tooth, and of means for securing said backing to said tooth, said tooth and backing being adapted for mounting on said anchor.

55. The combination of a T shaped anchor having a shank adapted to be screwed into a bridge, in combination with an artificial tooth having a longitudinal groove on its inner surface, of a plurality of pins ex- 1:

XVI'X'LTER M. JACKSON.

Witnesses V LOUIS A. SAISLE, CHARLES A. BRADY. 

